Engine - Yamaha WR450F Owner's Service Manual

ENGINE REMOVAL .........................................................................................6-1
REMOVING THE SILENCER.....................................................................6-6
REMOVING THE EXHAUST PIPE 2..........................................................6-6
REMOVING THE DRIVE SPROCKET .......................................................6-6
REMOVING THE ENGINE .........................................................................6-7
CLEANING THE SPARK ARRESTER .......................................................6-7
CHECKING THE SILENCER AND EXHAUST PIPE..................................6-8
INSTALLING THE ENGINE........................................................................6-8
INSTALLING THE BRAKE PEDAL ............................................................6-9
INSTALLING THE DRIVE SPROCKET......................................................6-9
INSTALLING THE EXHAUST PIPE AND MUFFLER.................................6-9
CAMSHAFT ....................................................................................................6-11
REMOVING THE CAMSHAFT .................................................................6-13
CHECKING THE CAMSHAFT..................................................................6-14
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET ..........6-15
CHECKING THE TIMING CHAIN TENSIONERS ....................................6-15
CHECKING THE DECOMPRESSION SYSTEM......................................6-16
INSTALLING THE CAMSHAFTS .............................................................6-16
CYLINDER HEAD...........................................................................................6-18
REMOVING THE CYLINDER HEAD........................................................6-20
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE) ......................6-20
CHECKING THE CYLINDER HEAD ........................................................6-20
INSTALLING THE CYLINDER HEAD ......................................................6-21
VALVES AND VALVE SPRINGS...................................................................6-23
REMOVING THE VALVES.......................................................................6-24
CHECKING THE VALVES AND VALVE GUIDES ...................................6-25
CHECKING THE VALVE SEATS .............................................................6-26
CHECKING THE VALVE SPRINGS.........................................................6-28
CHECKING THE VALVE LIFTERS ..........................................................6-29
INSTALLING THE VALVES .....................................................................6-29
CYLINDER AND PISTON...............................................................................6-31
REMOVING THE PISTON .......................................................................6-32
CHECKING THE CYLINDER AND PISTON ............................................6-32
CHECKING THE PISTON RINGS............................................................6-33
CHECKING THE PISTON PIN .................................................................6-34
INSTALLING THE PISTON AND CYLINDER ..........................................6-34
ELECTRIC STARTER ....................................................................................6-36
CHECKING THE STARTER MOTOR ......................................................6-38
ASSEMBLING THE STARTER MOTOR..................................................6-39

ENGINE

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